.el-collapse-item__content {
  position: relative;
}
.el-collapse-item__content .el-icon-caret-top {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  font-size: 14px;
}
.el-collapse-item__content .el-icon-caret-top:after {
  content: '收起代码';
  padding-left: 5px;
}
.el-collapse-item__content .el-icon-caret-top:hover {
  color: #409eff;
}

.el-collapse-item__content pre {
  margin-bottom: 10px;
}